我做了一个学生选课管理系统，在登陆的时候总是弹出一个对话框，提示Runtime出错，我用的是sqlserver2000的数据库服务器，登陆要用的用户ID和密码都保存在名为SC的数据库下的USER表中，用户ID和密码的输入分别用m_sUserID和m_sPassWord来记录，连接方式是ADO,我是用一个CString字符串传送sql语句，在执行ecord->open语句的时候出错，字符串如下：
"SELECT * FROM USER WHERE UserID=%s",m_sUserID

完整程序如下，
void CTestDlg::OnLogin()
{
    try
    {
    _RecordsetPtr pRecord;
    _variant_t value;
    if(UpdateData()==false)
    return;
        //生成Recordset实例
        pRecord.CreateInstance("ADODB.Recordset");
        CString sql;        
        sql.Format("SELECT * FROM USER WHERE UserID=%s",m_sUserID);

        //打开记录集
        pRecord->Open(sql.GetBuffer(0),_variant_t((IDispatch*)theApp.m_pConnection,true),adOpenStatic,adLockOptimistic,adCmdText);                     //这里提示出错
        if(!pRecord->State)
        {
            MessageBox("不存在该用户");
        }
        else
        {
            sql+="AND PassWord=";
            sql+=m_sPassWord;
            pRecord->Open(sql.GetBuffer(0),_variant_t((IDispatch*)theApp.m_pConnection,true),adOpenStatic,adLockOptimistic,adCmdText);
            if(!pRecord->State)
            {
                MessageBox("密码不正确");
            }
            else
            {

                MessageBox("登陆成功");
            }
        }
        pRecord->Close();
        pRecord=NULL;
    
    }
    catch(_com_error *e)
    {
        MessageBox(e->ErrorMessage());
    }    
    
}

请各位高手帮忙修改，感激不尽！

再补充一段代码，连接数据库的
BOOL CTestApp::InitInstance()
{
    AfxEnableControlContainer();
    //初始化OLE支持，使本程序可以访问数据库
    if(AfxOleInit()==false)
    {
        MessageBox(NULL,"初始化OLE支持失败","失败",MB_OK);
        return false;
    }
    //连接数据库
    try
    {
        HRESULT hr;
        hr = m_pConnection.CreateInstance("ADODB.Connection");///创建Connection对象
        if(SUCCEEDED(hr))
        {
        
        hr = m_pConnection->Open("Data Source=sc;UID=sa;PWD=;","","",adModeUnknown);

            if(SUCCEEDED(hr))
            {

            }
        }
    }
    catch(_com_error e)///捕捉异常
    {
        CString errormessage;
        errormessage.Format("连接数据库失败!\r\n错误信息:%s",e.ErrorMessage());
        AfxMessageBox(errormessage);///显示错误信息
        return FALSE;
    }
    try
    {
        if(m_pConnection->State)
        m_pConnection->Close(); ///如果已经打开了连接则关闭它
    }
    catch(...)
    {
    }

#ifdef _AFXDLL
    Enable3dControls();            // Call this when using MFC in a shared DLL
#else
    Enable3dControlsStatic();    // Call this when linking to MFC statically
#endif

    CTestDlg dlg;
    m_pMainWnd = &dlg;
    int nResponse = dlg.DoModal();
    if (nResponse == IDOK)
    {
        // TODO: Place code here to handle when the dialog is
        //  dismissed with OK
    }
    else if (nResponse == IDCANCEL)
    {
        // TODO: Place code here to handle when the dialog is
        //  dismissed with Cancel
    }

    // Since the dialog has been closed, return FALSE so that we exit the
    //  application, rather than start the application's message pump.
    return FALSE;
}

[[it] 本帖最后由 fingerplay 于 2008-7-12 13:22 编辑 [/it]]

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